fix: use integer value for catalog update interval

Author: TimilsinaBimal

.env.example

@@ -13,8 +13,8 @@ REDIS_CONNECTIONS_THRESHOLD=100
 
 # UPDATER
 AUTO_UPDATE_CATALOGS=True
-CATALOG_REFRESH_INTERVAL_SECONDS=6*60*60
+CATALOG_REFRESH_INTERVAL_SECONDS=21600 # 6*60*60 every ~6 hours
 
 # AI Catalog name generation
-GEMINI_API_KEY=<your_gemini_api_key>
+GEMINI_API_KEY=<your_gemini_api_key>   # Optional
 DEFAULT_GEMINI_MODEL="gemma-3-27b-it"